1.

Double penetration, involving two men (usually of a country bumpkin background) performing intercourse with various barnyard livestock. The testes will grind upon one another while violating the animal.Alcohol and Truth or Dare usually help. Cows and sheep are recommended. Chickens, not so much.

Merle and Jeb were done drunker than shit, so I dared em to a barnyard testicle sandwich on old man bubba's farm. That there horse never got it so good.